> On Oct 17, 2019, at 7:28 AM, Oleg Nesterov wrote:
>
> On 10/17, Song Liu wrote:
>>
>>
>>> On Oct 17, 2019, at 1:47 AM, Oleg Nesterov wrote:
>>>
>>> On 10/16, Song Liu wrote:
> On Oct 16, 2019, at 5:10 AM, Oleg Nesterov wrote:
>
>> @@ -489,6 +492,9 @@ int uprobe_write_
On 10/17, Song Liu wrote:
>
>
> > On Oct 17, 2019, at 1:47 AM, Oleg Nesterov wrote:
> >
> > On 10/16, Song Liu wrote:
> >>
> >>> On Oct 16, 2019, at 5:10 AM, Oleg Nesterov wrote:
> >>>
> @@ -489,6 +492,9 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe,
> struct mm_struct *mm,
>
> On Oct 17, 2019, at 1:47 AM, Oleg Nesterov wrote:
>
> On 10/16, Song Liu wrote:
>>
>>> On Oct 16, 2019, at 5:10 AM, Oleg Nesterov wrote:
>>>
@@ -489,6 +492,9 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe,
struct mm_struct *mm,
if (ret <= 0)
goto
On 10/16, Song Liu wrote:
>
> > On Oct 16, 2019, at 5:10 AM, Oleg Nesterov wrote:
> >
> >> @@ -489,6 +492,9 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe,
> >> struct mm_struct *mm,
> >>if (ret <= 0)
> >>goto put_old;
> >>
> >> + WARN(!is_register && PageCompound(old_pag
> On Oct 16, 2019, at 5:10 AM, Oleg Nesterov wrote:
>
> On 10/16, Song Liu wrote:
>>
>> --- a/kernel/events/uprobes.c
>> +++ b/kernel/events/uprobes.c
>> @@ -474,14 +474,17 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe,
>> struct mm_struct *mm,
>> struct vm_area_struct *vma;
>>
On 10/16, Song Liu wrote:
>
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -474,14 +474,17 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe,
> struct mm_struct *mm,
> struct vm_area_struct *vma;
> int ret, is_register, ref_ctr_updated = 0;
> bool orig_
Attaching uprobe to text section in THP splits the PMD mapped page table
into PTE mapped entries. On uprobe detach, we would like to regroup PMD
mapped page table entry to regain performance benefit of THP.
However, the regroup is broken For perf_event based trace_uprobe. This is
because perf_even
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